Nope. If you're a Gravelord Servant before the fight, killing him will force you to leave the covenant.

Just so you're aware, there's very little reason not to join most covenants when asked. Excluding the Forest Covenant, none of them will hate you if you leave, and you can just rejoin any covenant. A lot of covenants give you stuff just for joining(Such as Gravelord Servants, which you get the Gravelord Sword just for joining.)---PSN: NeutralBees | Xlink Kai: NeutralBeeshttp://youtube.com/user/Ulttimaa

Ulttimaa posted...Just so you're aware, there's very little reason not to join most covenants when asked. Excluding the Forest Covenant, none of them will hate you if you leave, and you can just rejoin any covenant. A lot of covenants give you stuff just for joining(Such as Gravelord Servants, which you get the Gravelord Sword just for joining.)

I see. I ended up not joining because I didn't want to commit a sin. I wish it was more difficult to break some of the covenants in this game.